Question on PCV valve, blow by, and catch cans...

TheOdessa · January 1st, 2012, 09:27 PM

Hey guys,
Trying to track down something I've noticed recently which is excessive white smoke out of the exhaust. While it doesn't smell sweet and I don't see the coolant levels dropped, I was chasing other possibilities. I went to change my PCV valve, which I am assuming the previous owner didn't change, and I saw excessive amounts of oil on the connector neck for the tube that goes into the upper plenum. The tube was also filled with oil as well. From what I've read, this can indicate excessive blow by and a bad PCV correct? The old valve rattled. So my question is, is this normal? Was my PCV valve? Should I get an oil catch can? And what would cause the excessive oil? The below picture sucks, but the connector to the tube is drenched in oil while the part that goes into the valve covers was clean and free of oil...

As far as catch cans go, where is a good place to get a decently priced one?

stal94gt · January 1st, 2012, 09:30 PM

pcv valve is a check valve. it rattles when it is new. its primary job is to make sure that the crank case cant be pressurised. as for the oil going up the tube, it is common. its in your intake and it will draw in oil vapers.

TheOdessa · January 1st, 2012, 09:53 PM

I suppose I am misunderstanding blow by then. I thought it was excessive oil getting sucked into the intake and burning. If I was to get a catch can, where would I connect it?

stal94gt · January 1st, 2012, 10:00 PM

blow-by is when your pistons loose compression by allowing fuel and air slip pass the rings. one of the side effects is white smoke poofing from your oil cap. kind of looks like a steam train, and when you rev it the smoke gets denser.

TheOdessa · January 1st, 2012, 10:06 PM

Interesting. What I am battling right now is excessive white smoke from my tailpipe, mostly noticed after idling for a minute then taking off. Drive thru's and long red lights are noted mostly. If I idle for a bit then take off, white smoke comes out the rear end. It isn't just a little either. Sometimes it can be embarrassing. The smoke does not smell sweet, so I am not sure what is going on.

stal94gt · January 1st, 2012, 10:10 PM

It could be a few things. Since im not there to see it its hard to be exact. You could be getting oil leaking past your valve guide seals. It could be a crack in your intake manifold, bad intake manifold gasket. It could be condensation from the out side temps dropping

TheOdessa · January 1st, 2012, 10:13 PM

Intake manifold and gasket are pretty new. Installed the FRPP intake and felpro gasket with high temp copper sealant around the intake ports. I ruled out condensation due to happening even after an hour of driving.

How would I test for leaking valve guide seals?

stal94gt · January 1st, 2012, 10:17 PM

No real test for it

TheOdessa · January 1st, 2012, 10:34 PM

I'm guessing except for the smoke coming out the rear. Compression nor a leakdown test will work huh?

stal94gt · January 1st, 2012, 10:40 PM

Originally Posted by TheOdessa

I'm guessing except for the smoke coming out the rear. Compression nor a leakdown test will work huh?

Nope

TheOdessa · January 1st, 2012, 10:42 PM

Thank you for your help sir!

January 1st, 2012, 09:27 PM	#1
TheOdessa Chitty Chitty Bang Bang 2001 Mustang GT Join Date: Jun 2011 Location: Tampa, Florida Posts: 1,254 iTrader: 2 reviews	Question on PCV valve, blow by, and catch cans... Hey guys, Trying to track down something I've noticed recently which is excessive white smoke out of the exhaust. While it doesn't smell sweet and I don't see the coolant levels dropped, I was chasing other possibilities. I went to change my PCV valve, which I am assuming the previous owner didn't change, and I saw excessive amounts of oil on the connector neck for the tube that goes into the upper plenum. The tube was also filled with oil as well. From what I've read, this can indicate excessive blow by and a bad PCV correct? The old valve rattled. So my question is, is this normal? Was my PCV valve? Should I get an oil catch can? And what would cause the excessive oil? The below picture sucks, but the connector to the tube is drenched in oil while the part that goes into the valve covers was clean and free of oil... As far as catch cans go, where is a good place to get a decently priced one? __________________ 2001 Mustang GT 5-Speed God Created Man, but Sam Colt Made Them Equal

January 1st, 2012, 09:30 PM	#2
stal94gt I Post Entirely Way Too Much 2003 mustang v6 ;) slow Join Date: May 2010 Location: eglin afb florida Posts: 10,197 iTrader: 2 reviews	pcv valve is a check valve. it rattles when it is new. its primary job is to make sure that the crank case cant be pressurised. as for the oil going up the tube, it is common. its in your intake and it will draw in oil vapers. __________________ bone stock from the factory!

January 1st, 2012, 09:53 PM	#3
TheOdessa Chitty Chitty Bang Bang 2001 Mustang GT Join Date: Jun 2011 Location: Tampa, Florida Posts: 1,254 iTrader: 2 reviews	I suppose I am misunderstanding blow by then. I thought it was excessive oil getting sucked into the intake and burning. If I was to get a catch can, where would I connect it? __________________ 2001 Mustang GT 5-Speed God Created Man, but Sam Colt Made Them Equal

January 1st, 2012, 10:00 PM	#4
stal94gt I Post Entirely Way Too Much 2003 mustang v6 ;) slow Join Date: May 2010 Location: eglin afb florida Posts: 10,197 iTrader: 2 reviews	blow-by is when your pistons loose compression by allowing fuel and air slip pass the rings. one of the side effects is white smoke poofing from your oil cap. kind of looks like a steam train, and when you rev it the smoke gets denser. __________________ bone stock from the factory!

January 1st, 2012, 10:06 PM	#5
TheOdessa Chitty Chitty Bang Bang 2001 Mustang GT Join Date: Jun 2011 Location: Tampa, Florida Posts: 1,254 iTrader: 2 reviews	Interesting. What I am battling right now is excessive white smoke from my tailpipe, mostly noticed after idling for a minute then taking off. Drive thru's and long red lights are noted mostly. If I idle for a bit then take off, white smoke comes out the rear end. It isn't just a little either. Sometimes it can be embarrassing. The smoke does not smell sweet, so I am not sure what is going on. __________________ 2001 Mustang GT 5-Speed God Created Man, but Sam Colt Made Them Equal

January 1st, 2012, 10:10 PM	#6
stal94gt I Post Entirely Way Too Much 2003 mustang v6 ;) slow Join Date: May 2010 Location: eglin afb florida Posts: 10,197 iTrader: 2 reviews	It could be a few things. Since im not there to see it its hard to be exact. You could be getting oil leaking past your valve guide seals. It could be a crack in your intake manifold, bad intake manifold gasket. It could be condensation from the out side temps dropping __________________ bone stock from the factory!

January 1st, 2012, 10:13 PM	#7
TheOdessa Chitty Chitty Bang Bang 2001 Mustang GT Join Date: Jun 2011 Location: Tampa, Florida Posts: 1,254 iTrader: 2 reviews	Intake manifold and gasket are pretty new. Installed the FRPP intake and felpro gasket with high temp copper sealant around the intake ports. I ruled out condensation due to happening even after an hour of driving. How would I test for leaking valve guide seals? __________________ 2001 Mustang GT 5-Speed God Created Man, but Sam Colt Made Them Equal

January 1st, 2012, 10:17 PM	#8
stal94gt I Post Entirely Way Too Much 2003 mustang v6 ;) slow Join Date: May 2010 Location: eglin afb florida Posts: 10,197 iTrader: 2 reviews	No real test for it __________________ bone stock from the factory!

January 1st, 2012, 10:34 PM	#9
TheOdessa Chitty Chitty Bang Bang 2001 Mustang GT Join Date: Jun 2011 Location: Tampa, Florida Posts: 1,254 iTrader: 2 reviews	I'm guessing except for the smoke coming out the rear. Compression nor a leakdown test will work huh? __________________ 2001 Mustang GT 5-Speed God Created Man, but Sam Colt Made Them Equal

January 1st, 2012, 10:42 PM	#11
TheOdessa Chitty Chitty Bang Bang 2001 Mustang GT Join Date: Jun 2011 Location: Tampa, Florida Posts: 1,254 iTrader: 2 reviews	Thank you for your help sir! __________________ 2001 Mustang GT 5-Speed God Created Man, but Sam Colt Made Them Equal

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